<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<!--hello我是标签-->
<body>hello</body>
<h1>1</h1>
<h2>2</h2>
<h3>3</h3>
<h4>4</h4>
<h5>5</h5>
<h6>6</h6>
</html>